Four members of a Scots drug gang have been given prison sentences totalling more than 21 years.

George McKenzie, 31, Matthew Graham, 35, and Christopher Martin, 36, were caught mixing cocaine during a police raid at a garage in Glasgow last year.

The raid was prompted after the fourth man, Mark Agnew, 23, was stopped on a motorway slip road near Paisley.

Passing sentence, Lord Burns said they had admitted involvement in the supply of a "substantial amount" of cocaine.

An earlier court hearing was told McKenzie, Graham and Martin were working in a "cutting factory" where pure cocaine was mixed with adulterants to bulk it out so dealers could make more profit.

The High Court in Livingston heard police recovered quantities of the Class A drug with an estimated street value of up to £100,000 following a raid on the Autoshine garage at Heatheryknowe Farm, Glasgow, on 12 May 2014.

McKenzie was sentenced to six years and eight months while Graham was ordered to serve six years and four months. Martin was jailed for five years.

Agnew was sentenced to three years and four months.

Judge Lord Burns added: "Despite the level of purity which on any view was low, the values are also significant.

"The fact is for at least three of you cocaine would have been distributed to the public with all the attendant misery that that would cause."